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a) X-ray image of an excised human prostate showing a single calcification. b) Ultrasound image of the prostate sample. This image presents an excessive amount of speckle and fails to reveal the calcification, c) Vibro-acoustography scan of the same tissue focused at 15 mm depth inside the sample. This speckle-free image shows the calcification at the center of prostate. [Reprinted from [95] with permission from Elsevier.]
